diff --git a/tests/components/lametric/test_config_flow.py b/tests/components/lametric/test_config_flow.py
index 4113d585ccc..9b00c1e89aa 100644
--- a/tests/components/lametric/test_config_flow.py
+++ b/tests/components/lametric/test_config_flow.py
@@ -706,7 +706,7 @@ async def test_dhcp_discovery_updates_entry(
         data=DhcpServiceInfo(
             hostname="lametric",
             ip="127.0.0.42",
-            macaddress="aa:bb:cc:dd:ee:ff",
+            macaddress="aabbccddeeff",
         ),
     )
 
@@ -732,7 +732,7 @@ async def test_dhcp_unknown_device(
         data=DhcpServiceInfo(
             hostname="lametric",
             ip="127.0.0.42",
-            macaddress="aa:bb:cc:dd:ee:00",
+            macaddress="aabbccddee00",
         ),
     )